Process for the production of hcl gas from chloride salts and for the production of carbohydrates

Abstract

A process for the co-production of gaseous HCl and a salt product comprising a cation and an anion, which process comprises the steps of a. providing an aqueous solution comprising protons, chloride anions, and cations and anions of the salt product, b. bringing the solution into contact with a substantially immiscible extractant, the extractant comprising: 1) an oil soluble amine, which amine is substantially water insoluble both in free and in salt form; and 2) a carrier solvent for the amine; whereupon HCl selectively transfers to the extractant to form an HCl-carrying extractant and a chloride depleted aqueous solution containing the salt product; c. separating the HCl-carrying extractant from the chloride-depleted aqueous solution; and d. distilling HCl from the separated HCl-carrying extractant to form gaseous HCl and HCl depleted extractant.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of PCT International Application Serial No. PCT / IL2009 / 000843 filed on Sep. 1, 2009, which claims the benefit of Israeli Patent Application Nos. 193,826 filed on Sep. 2, 2008, and 200,646 filed on Aug. 31, 2009, the contents of each of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a process for the production of HCl gas from a chloride salt. More particularly, the present invention relates to a process for the co-production of gaseous HCl and a product salt from chloride salt, e.g., an alkali or ammonium chloride salt, and acids other than hydrochloride acid or acidic salts of such acid as well as to a process for the production of carbohydrates.BACKGROUND OF THE INVENTION[0003]As used in the present application HCl denotes hydrogen chloride. HCl by itself forms a gas phase and is commonly described as “HCl gas”.[0004]Alkali chlorides, primarily s...

AI Technical Summary

Benefits of technology

[0008]It was surprisingly found that the aim of direct conversion of alkali chlorides, which denoted MCl, to salts of inorganic or organic acids, which acids are denoted HX, can be achieved for a wide variety of acids that satisfy the conditions of being of weaker acidity than hydrochloric acid, as measu

Problems solved by technology

Such direct conversion to alkali salt and HCl is, however, restricted in practice to sulfuric acid that has the low volatility and the thermal stability required for reactions at high temperature.